dot product

基本解释

Let us take a down-to-earth example of a dot product.
举一个点积的,现实例子。
So, the first things that we learned about in this class were vectors, and how to do dot-product of vectors.
这门课我们首先学习的概念是向量，以及怎样做向量的内积。
You can immediately see by looking at this-- - it's easier to see than looking here-- 0 that the dot product can be larger than zero 0 it can be equal to zero 0 and it can be smaller than zero.
通过这个公式你立刻可以得出-,这比上面公式快多了-,点积可以大于,可以等于,也可以小于。

Green Dot shares lost nearly 20% this morning after Wal-Mart and American Express said it would roll out a competing product.
FORBES: Red Light For Green Dot Investors On Wal-Mart, Amex Threat